Pattern Variety of Tetrahydrofuran Clathrate Hydrates Formed in Porous Media
Pattern Variety of Tetrahydrofuran Clathrate Hydrates Formed in Porous Media
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DOI：
10.1021/jp306224w
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发表时间：
2012-10
影响因子：
3.7
通讯作者：
M. Muraoka;Kazushige Nagashima
中科院分区：
文献类型：
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作者：
M. Muraoka;Kazushige Nagashima
我们观察了四氢呋喃笼状水合物在四氢呋喃-17H2O溶液和玻璃微珠(直径分别为2和50μm)中的图案形成。利用定向生长装置控制水合物的总生长速率V。我们首次成功地获得了多种水合物模式：较高V值的浸染型，中等V值的结节型，以及较低V值的块状和层状型。用多种方法对得到的水合物图像进行了分析，以定量描述水合物的形态。图像处理保留了较大的水合物区域(占分离生长形成的水合物总面积的90%)，适合于估算水合物颗粒数密度和占水合物总面积的平均水合物面积。水合物的分离生长面积是对水合物类型进行定量分类的最有用的指标之一。图像分析结果表明，水合物的偏析生长区域是水合物的主要生长区域。
We observed the pattern formation of tetrahydrofuran (THF) clathrate hydrates in a mixture of a THF–17H2O solution and glass beads (2 and 50 μm diameter). The overall hydrate growth rate, V, was controlled using a directional growth apparatus. We are the first to successfully obtain a variety of hydrate patterns: a disseminated type at higher V values, a nodular type in the middle range of V, and massive and layer types at lower V values. The hydrate images obtained were analyzed by several methods to quantitatively characterize the patterns. Image processing retaining the relatively large hydrate regions (90% of the total hydrate area formed by segregated growth) was suitable for evaluating the number density of the hydrate grains and the average hydrate area, which dominated the total hydrate area. The segregated growth area of the hydrates was one of the most useful indices for quantitatively categorizing the hydrate types. The image analysis results showed that the segregated growth area of the hydrat...